Lorentz invariance relations for twist-3 functions and frame-independence of twist-3 cross sections

Apr 12, 2016, 4:30 PM
15m
SR4a (DESY Hamburg)

SR4a

DESY Hamburg

Spin Physics WG6 Spin Physics

Speaker

Prof. Yuji Koike (Department of Physics, Niigata University)

Description

We derive a complete set of relations among twist-3 distribution and fragmentation functions based on the QCD equation-of-motion and identities among nonlocal operators which fully incorporate the constraints from Lorentz invariance. We show that the dynamical twist-3 functions constitute a complete set of twist-3 functions and other types of twist-3 functions can be expressed in terms of the dynamical ones and the twist-2 functions. We also show that those relations guarantee the frame-independence of the twist-3 observables.

Primary author

Prof. Yuji Koike (Department of Physics, Niigata University)

Co-authors

Prof. Andreas Metz (Temple University) Dr Daniel Pitonyak (RIKEN BNL Research Center) Dr Koichi Kanazawa (Temple University) Dr Marc Schlegel (University of Tuebingen)

Presentation materials